Bukkit

This Plugin will add the four Seasons to Minecraft

RandomEncounters adds configurable random structure, treasure, and mob generation to the world

Generates Cloud-Structures of snow blocks in the sky

PreGenerator

Survival Games Automated

Completely overhauls the End dimension with new biomes, structures, bosses and more!

Save, load, reset any worlds.

A plugin that randomly will generate .schematic files into your world.

Don't let your players enter a world (forever or temporarly) if they die in it.

Cave Ore Veins

world generator based on sethbling's MCEdit filter

Spawns minecraft .schematics randomly in newly generated chunks

Fjord

Temporary discussion page/forum & hopeful placeholder

The Hidden Lorax will automatically plant saplings left on the ground.

EnderDoors!

The Best Plugin for Integrating Adventure Maps onto your Server

Phoenix Terrain is a World Generation Plugin that allows users to create custom worlds based on in game generation variables

MaxiWorld came from a simple question from my kids: What if the blocks were bigger?

A very complete plugin for creating a personal UHC environment.